实现的功能：添加、修改和浏览记录（包括姓名，年龄，职位，薪酬）。
运行程序显示结果如下：
1、添加记录：
2、修改记录：
3、浏览记录：
4、退出系统：
各类之间调用关系如下图所示：
程序代码如下：
import com.dr.demo.menu.Menu;
public class Main {
public static void main(String[] args) {
new Menu();
}
}
public class Menu {
InputData input = null;
public Menu(){
this.input = new InputData();
//循环出现菜单
while(true){
this.show();
}
}
//要定义的菜单的内容
public void show(){
System.out.println("\t\t\t\t1~增加人员信息");
System.out.println("\t\t\t\t2~修改人员信息");
System.out.println("\t\t\t\t3~浏览人员信息");
System.out.println("\t\t\t\t4~退出本系统！");
System.out.println("\n\n请选择要使用的操作：（1.2.3.4）");
int temp = input.getInt();
switch(temp){
case 1:{//增加人员信息
new PersonOperate().add();//业务处理层
break;
}
case 2:{//修改人员信息
new PersonOperate().update();
break;
}
case 3:{//浏览人员信息
new PersonOperate().show();
break;
}
case 4:{//退出系统
System.out.println("选择的是退出本系统！");
System.out.println("成功退出本系统！");
System.exit(1);
}
default:{
System.out.println("输入的内容不正确，请重新输入！");
break;
}
}
}
}
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class InputData {
public BufferedReader buf = null;
public InputData(){
buf = new BufferedReader(new InputStreamReader(System.in));
}
public String getString(){
String str = null;
try {
str = buf.readLine();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return str;
}
public int getInt(){
int temp = 0;
String str = null;
boolean flag = true;
while(flag){
//输入数据
str = this.getString();
if(!(str.matches("\\d+"))){
//输入的不是1-4的数，提示重新输入
System.out.println("输入的数字有误，请重新输入！（必须是整数1-4）");
}
else {//数据输入正确，进行转换
temp = Integer.parseInt(str);
//退出循环
flag = false;
}
}
return temp;
}
public String getpsString(){
String str = null;
try {
str = buf.readLine();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return str;
}
public float getFloat(){
float f = 0;
String str = null;
boolean flag = true;
while(flag){
str = this.getString();
if(!(str.matches("\\d+?.\\d{1,2}"))){
//如果输入的不是两位的小数则提示重新输入
System.out.println("输入的数必须是float类型，请重新输入！");
}
else{
f = Float.parseFloat(str);
flag = false;//退出循环哈
}
}
return f;
}
}
public class PersonOperate {
private InputData input = null;
public PersonOperate(){
this.input = new InputData();
}
//增加记录
public void add(){
String name = null;
int age = 0;
String position = null;
float salary = 0;
System.out.println("请输入姓名：");
name = this.input.getString();
System.out.println("请输入年龄：");
age = this.input.getInt();
System.out.println("请输入职位：");
position = this.input.getpsString();
System.out.println("请输入薪酬：");
salary = this.input.getFloat();
//生成对象并保存在文件中
Person p = new Person(name,age,position,salary);
try{
new FileOperate().save(p);//IO操作层
System.out.println("数据保存成功！");
}catch(Exception e){
System.out.println("数据保存失败！");
}
}
//浏览记录
public void show(){
Person p = null;
try{
p = (Person)new FileOperate().read();
}catch(Exception e){
System.out.println("显示数据失败，请检查数据是否存在！");
}
if(p!= null){
System.out.println(p);
}
}
//修改记录
public void update(){
Person p = null;
try{
p = (Person)new FileOperate().read();
}catch(Exception e){
System.out.println("显示数据失败，请检查数据是否存在！");
}
if(p!=null){
String name = null;
int age = 0;
String position = null;
float salary = 0.0f;
System.out.println("请输入新姓名：（原姓名："+p.getName()+"）");
name = this.input.getString();
System.out.println("请输入新年龄：（原年龄"+p.getAge()+"）");
age = this.input.getInt();
System.out.println("请输入新职位：（原职位"+p.getPosition()+"）");
position = this.input.getpsString();
System.out.println("请输入新工资：（原工资"+p.getSalary()+"）");
salary = this.input.getFloat();
//信息重置
p.setName(name);
p.setAge(age);
p.setPosition(position);
p.setSalary(salary);
try{
new FileOperate().save(p);
System.out.println("数据更新成功！");
}catch(Exception e){
System.out.println("数据更新失败！");
}
}
}
}
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
public class FileOperate {
public static final String FILENAME = "e:"+File.separator+"person.ser";
//把对象保存在文件中
public void save(Object obj){
ObjectOutputStream out = null;
try{
out = new ObjectOutputStream(new FileOutputStream(new File(FILENAME)));
//写入对象
out.writeObject(obj);
}catch(Exception e){
try{
throw e;
}catch(Exception e1){}
}finally{
try{
out.flush();
out.close();
}catch(Exception e){}
}
}
//从文件中读出对象
public Object read() throws Exception{
Object obj = null;
ObjectInputStream input =null;
try{
input = new ObjectInputStream(new FileInputStream(new File(FILENAME)));
obj = input.readObject();
}catch(Exception e){
throw e;
}finally{
try{
input.close();
}catch(Exception e){}
}
return obj;
}
}
import java.io.Serializable;
public class Person implements Serializable{
public String toString(){
return "姓名："+this.name+"\t年龄："+this.age+" \t职位："+this.position+"\t薪酬："+this.salary;
}
private String name;
private int age;
private String position;
private float salary;
public Person(){}
public Person(String name,int age,String position,float salary){
this.name = name;
this.age = age;
this.position = position;
this.salary = salary;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getPosition() {
return position;
}
public void setPosition(String position) {
this.position = position;
}
public float getSalary() {
return salary;
}
public void setSalary(float salary) {
this.salary = salary;
}
}
本程序优点在于各层之间耦合性不大，独立性比较强，重在理解Menu层、文件操作层、IO操作层三层之间的调用关系。存在的缺陷希望读者可以完善。